Fig. 1: Crystal structure and morphology of the PdCux/ZnO catalysts.

a XRD patterns of ZnO, Cu/ZnO, and PdCux/ZnO catalysts in the 40°–45° range. b HAADF-STEM images and EDS elemental mapping images of Pd/ZnO. c HAADF-STEM images of PdCu1/ZnO, together with the corresponding line-scan analysis and EDS elemental mapping.